Impact of MoS2 Monolayers on the Thermoelastic Response of Silicon Heterostructures
Publisher DOI
Abstract
Understanding the thermoelastic response of a nanostructure is crucial for the choice of materials and interfaces in electronic devices with improved and tailored transport properties at the nanoscale. Here, we show how the deposition of a MoS2 monolayer can strongly modify the nanoscale thermoelastic dynamics of silicon substrates close to their interface. We demonstrate this by creating a transient grating with extreme ultraviolet light, using ultrashort free-electron laser pulses, whose ≈84 nm period is comparable to the size of elements typically used in nanodevices, such as electric contacts and nanowires. The thermoelastic response, featuring coherent acoustic waves and incoherent relaxation, is tangibly modified by the presence of monolayer MoS2. Namely, we observed a major reduction of the amplitude of the surface mode, which is almost suppressed, while the longitudinal mode is basically unperturbed, aside from a faster decay of the acoustic modulations. We interpret this behavior as a selective modification of the surface elasticity, and we discuss the conditions to observe such effect, which may be of immediate relevance for the design of Si-based nanoscale devices.
Date Issued
2024-07-01
Publication Type
Article
Author(s)
Soranzio, Davide | |
Puntel, Denny | |
Tuniz, Manuel | |
Majchrzak, Paulina E. | |
Milloch, Alessandra | |
Olsen, Nicholas M. | |
Bronsch, Wibke | |
Jessen, Bjarke S. | |
Pelli Cresi, Jacopo S. | |
De Angelis, Dario | |
Foglia, Laura | |
Mincigrucci, Riccardo | |
Zhu, Xiaoyang | |
Dean, Cory R. | |
Ulstrup, Søren | |
Banfi, Francesco | |
Giannetti, Claudio | |
Parmigiani, Fulvio | |
Bencivenga, Filippo | |
Cilento, Federico |
Additional Credits
Journal
ACS Applied Nano Materials
Publisher
American Chemical Society
ISSN
2574-0970
Access(Rights)
open.access